|I've had one of these for about four or five years now, and it's a good little power supply.|
The Noise Offset feature is occasionally useful, and it's certainly a cheaper solution than spending a fortune trying (usually unsuccessfully) to completely eliminate the switch-mode hash. If a spurie lands on your frequency just twist the knob a fraction and it disappears!
The fan is noisy as all hell, but it should only come on if the unit overheats - despite the experience of the previous reviewer, it should NOT be on all the time. It is triggered by a cheap temperature-sensing switch , which packed a sad in my unit, such that once triggered, the fan would not shut off again. I replaced the switch with one of a slightly higher temperature rating, and fastened the aluminium plate on which the heat-generating components are mounted (in the absence of a proper heat-sink) more firmly to the steel case base, with heat grease between to help transfer the heat from the plate to the case. Then I cut a hole in the shelf below the unit and mounted below it the quietest 12v fan I could get to blow cold air over the bottom of the unit. Result - no more noisy fan.
As bought, then , it's not perfect, but with a little help it does its job without fuss. The unit now happily powers my Icom 7410 and 2700H rigs. As long as it keeps going, I'll keep it.